Fluoropolymer hangata ke olefinic polymer e nang le li-olefinic monomers tse sa fellang kapa ka botlalo tse kang vinylidene fluoride (CH2¼CF2) le tetrafluoroethylene (TFE) (CF2¼CF2).Li-polymer tsena li 'nile tsa koaheloa ka ho qaqileng haholo litšupisong tse' maloa.Li-polymer tse khethehileng tse nang le fluorinated li kenyelletsa per-fluoroethers, fluoroacrylates, le fluorosilicones tse sebelisoang ka molumo o monyenyane haholo ho feta olefinic fluoropolymers.
Li-fluoropolymers tsa khoebo li kenyelletsa homopolymers le copolymers.Li-Homopolymers li na le 99% kapa ho feta ka boima ba monoma e le 'ngoe le 1% kapa ka tlase ho boima ba monoma e mong ho ea ka kopano ea American Society for Testing Materials (ASTM).Li-copolymers li na le ho feta 1% kapa ho feta ka boima ba motsoako o le mong kapa ho feta.Li-fluoropolymers tse kholo tsa khoebo li thehiloe ho li-monomers tse tharo:
TFE, vinylidene fluoride (VF2), le ho isa tekanyong e nyane chlorotrifluoroethylene (CTFE).Mehlala ea li-comonomers e kenyelletsa perfluoromethyl vinyl ether (PMVE), perfluoroethyl vinyl ether (PEVE), perfluoropropyl vinyl ether (PPVE), hexafluoropropylene (HFP), CTFE, perfluorobutyl ethylene (PFBE), le monomers exotic joalo ka 2,2robistri- -4,5-difluoro-1,3-dioxole.
Molao o motle o lokelang ho hopoloa ke hore ho eketseha ha fluorine ea molek'hule ea polymer ho eketsa khanyetso ea lik'hemik'hale le ho qhibiliha, ho hanyetsa lelakabe, le ho etsa lifoto;e ntlafatsa thepa ea eona ea motlakase joalo ka dielectric tse tlase;e fokotsa coefficient ea likhohlano;e phahamisa ntlha ea ho qhibiliha;e eketsa botsitso ba eona ba mocheso;le ho fokolisa thepa ea eona ea mochine.Ho qhibiliha ha li-polymers ka lihlapolli hangata ho fokotseha ka ho eketsa litaba tsa fluorine tsa molek'hule.
Sehlopha sa Fluoropolymer
The serendipitous sibollo ea PTFE ka 1938 ke Roy Plunkett oa DuPont Company e qalile mehla ea fluoropolymers.PTFE e fumane likete tsa likopo ka lebaka la thepa ea eona e ikhethang.Ho entsoe li-fluoroplastic tse fapaneng ho tloha ha ho sibolloa PTFE.Lik'hamphani tse 'maloa li hlahisa lipolasetiki tsena lefatšeng ka bophara.Li-fluoropolymers li arotsoe ka lihlopha tse peli tsa li-polymer tse nang le perfluorinated le karolo ea fluorinated polymers.Perfluorinated fluoropolymers ke homopolymers le copolymers tsa TFE.Tse ling tsa li-comonomer li ka ba le likarolo tse nyane ntle le C kapa F.
Nalane ea nts'etsopele ea polymer
PTFE e ke ke ea etsoa ka mekhoa ea ho qhibiliha ka lebaka la viscosity ea eona e phahameng.Melt-processible fluoropolymers li entsoe ka copolymerization ea TFE.FEP, e leng copolymer ea TFE le HFP, e na le mocheso o tlaase o tsoelang pele oa ho sebelisa mocheso ho feta PTFE (200 C vs. 260 C) ka lebaka la ho senyeha ha thepa ea mechine.PFA, copolymer ea TFE e nang le PPVE kapa PEVE, e fana ka botsitso ba mocheso, ts'ebetso ea ho qhibiliha le tšebeliso e phahameng e tsoelang pele mocheso oa 260 C. Ka bobeli FEP le PFA li nkoa e le li-perfluoropolymers.
Li-copolymers tsa ethylene tse nang le tetrafluoroethylene (ETFE) le chlorotrifluoroethylene (ECTFE) li matla ho feta li-perfluoropolymers, li tsamaisana le tradeoffs ea ho fokotsa lik'hemik'hale tsa bona tsa lik'hemik'hale le mocheso o tsoelang pele oa tšebeliso le ho eketseha ha coefficient ea khohlano.
Li-amorphous copolymers tsa TFE li qhibiliha ka li-solvents tse khethehileng tsa halogenated 'me li ka sebelisoa holim'a metsi e le tharollo ea polymer ho etsa litlolo tse tšesaane.Koko e omisitsoeng e hanana le lik'hemik'hale tse ngata joalo ka PTFE.
Nako ea poso: Jul-22-2017